Unit and kernel tests seem to work well, but when I try to create a simple functional test (BrowserTestBase extension), and then run it from the d8test container (apache / php), the message d & rsquo; Following error in the poster:

I've tried changing the URL value of SIMPLETEST_BASE_URL, I have tried different ports, http and https, but I usually get the error below:

curl: (7) Can not connect to [url] Harbor [port]: Connection refused.

I suspect that my problem has something to do with Traefik requiring a valid certificate (I've generated a self-signed certificate that I use to access the site in Chrome / FF), but I'm really not sure to know if going in the right direction here, maybe I miss something more fundamental. Any help would be appreciated.